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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel</a></div> |
| <h1 title="Interface RelDistribution" class="title">Interface RelDistribution</h1> |
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| <dt>All Superinterfaces:</dt> |
| <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Comparable</a><<a href="../plan/RelMultipleTrait.html" title="interface in org.apache.calcite.plan">RelMultipleTrait</a>></code>, <code><a href="../plan/RelMultipleTrait.html" title="interface in org.apache.calcite.plan">RelMultipleTrait</a></code>, <code><a href="../plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a></code></dd> |
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| <pre>public interface <span class="typeNameLabel">RelDistribution</span> |
| extends <a href="../plan/RelMultipleTrait.html" title="interface in org.apache.calcite.plan">RelMultipleTrait</a></pre> |
| <div class="block">Description of the physical distribution of a relational expression. |
| |
| <p>TBD:</p> |
| <ul> |
| <li>Can we shorten <a href="RelDistribution.Type.html#HASH_DISTRIBUTED"><code>RelDistribution.Type.HASH_DISTRIBUTED</code></a> to HASH, etc.</li> |
| <li>Do we need <a href="RelDistributions.html" title="class in org.apache.calcite.rel"><code>RelDistributions</code></a>.DEFAULT?</li> |
| <li><a href="RelDistributionTraitDef.html#convert(org.apache.calcite.plan.RelOptPlanner,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.RelDistribution,boolean)"><code>RelDistributionTraitDef.convert(org.apache.calcite.plan.RelOptPlanner, org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelDistribution, boolean)</code></a> |
| does not create specific physical operators as it does in Drill. Drill |
| will need to create rules; or we could allow "converters" to be |
| registered with the planner that are not trait-defs. |
| </ul></div> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelDistribution.Type.html" title="enum in org.apache.calcite.rel">RelDistribution.Type</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Type of distribution.</div> |
| </td> |
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| <td class="colFirst"><code><a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#apply(org.apache.calcite.util.mapping.Mappings.TargetMapping)">apply</a></span>​(<a href="../util/mapping/Mappings.TargetMapping.html" title="interface in org.apache.calcite.util.mapping">Mappings.TargetMapping</a> mapping)</code></th> |
| <td class="colLast"> |
| <div class="block">Applies mapping to this distribution trait.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i1"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getKeys()">getKeys</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the ordinals of the key columns.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i2"> |
| <td class="colFirst"><code><a href="RelDistribution.Type.html" title="enum in org.apache.calcite.rel">RelDistribution.Type</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getType()">getType</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the type of distribution.</div> |
| </td> |
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| <h3>Methods inherited from interface java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Comparable</a></h3> |
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| <h3>Methods inherited from interface org.apache.calcite.plan.<a href="../plan/RelMultipleTrait.html" title="interface in org.apache.calcite.plan">RelMultipleTrait</a></h3> |
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| <h3>Methods inherited from interface org.apache.calcite.plan.<a href="../plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a></h3> |
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| </a><code><a href="../plan/RelTrait.html#equals(java.lang.Object)">equals</a>, <a href="../plan/RelTrait.html#getTraitDef()">getTraitDef</a>, <a href="../plan/RelTrait.html#hashCode()">hashCode</a>, <a href="../plan/RelTrait.html#isDefault()">isDefault</a>, <a href="../plan/RelTrait.html#register(org.apache.calcite.plan.RelOptPlanner)">register</a>, <a href="../plan/RelTrait.html#satisfies(org.apache.calcite.plan.RelTrait)">satisfies</a>, <a href="../plan/RelTrait.html#toString()">toString</a></code></div> |
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| <h3><a id="getType()">getType</a></h3> |
| <div class="memberSignature"><span class="returnType"><a href="RelDistribution.Type.html" title="enum in org.apache.calcite.rel">RelDistribution.Type</a></span> <span class="memberName">getType</span>()</div> |
| <div class="block">Returns the type of distribution.</div> |
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| <section class="detail"> |
| <h3><a id="getKeys()">getKeys</a></h3> |
| <div class="memberSignature"><span class="returnType"><a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>></span> <span class="memberName">getKeys</span>()</div> |
| <div class="block">Returns the ordinals of the key columns. |
| |
| <p>Order is important for some types (RANGE); other types (HASH) consider |
| it unimportant but impose an arbitrary order; other types (BROADCAST, |
| SINGLETON) never have keys.</div> |
| </section> |
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| <section class="detail"> |
| <h3><a id="apply(org.apache.calcite.util.mapping.Mappings.TargetMapping)">apply</a></h3> |
| <div class="memberSignature"><span class="returnType"><a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a></span> <span class="memberName">apply</span>​(<span class="arguments"><a href="../util/mapping/Mappings.TargetMapping.html" title="interface in org.apache.calcite.util.mapping">Mappings.TargetMapping</a> mapping)</span></div> |
| <div class="block">Applies mapping to this distribution trait. |
| |
| <p>Mapping can change the distribution trait only if it depends on distribution keys. |
| |
| <p>For example if relation is HASH distributed by keys [0, 1], after applying |
| a mapping (3, 2, 1, 0), the relation will have a distribution HASH(2,3) because |
| distribution keys changed their ordinals. |
| |
| <p>If mapping eliminates one of the distribution keys, the <a href="RelDistribution.Type.html#ANY"><code>RelDistribution.Type.ANY</code></a> |
| distribution will be returned. |
| |
| <p>If distribution doesn't have keys (BROADCAST or SINGLETON), method will return |
| the same distribution.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../plan/RelTrait.html#apply(org.apache.calcite.util.mapping.Mappings.TargetMapping)">apply</a></code> in interface <code><a href="../plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>mapping</code> - Mapping</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>distribution with mapping applied</dd> |
| </dl> |
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